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Originally Posted by zpwnchen Yes. (It's nothng more than the Pythagorean Identity).
you have to remember only one thing
sin^2 x + cos^2 x = 1
you can replace by anything like 2x, 3x, Q, 2Q etc....It will always give you 1
Last edited by CaptainBlack; Oct 11th 2009 at 02:24 PM.
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